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Glossary » Materials » Polymers » Polyacetal » Homopolymer

Acetal is a subcategory of Polyacetal. Its flexural modulus ranges from 120 to 135 MPa. Its tensile strength ranges from 9700 to 10000 MPa at break. Its flexural strength ranges from 13600 to 16000 MPa. Its compressive strength ranges from 15600 to 18000 MPa. Its Izod Impact strength ranges from 1.1 to 2.3 J/cm. Its elongation at break ranges from 10 to 75 %. Its hardness ranges from 92 to 94 Rockwell M. Its coefficient of thermal expansion ranges from 50 to 112 x 10^-6/°C. Its melting temperature ranges from 172 to 184 °C. Its molding pressure ranges from 10 to 20 MPa.

Polyacetal, also known as Acetal, is a thermoplastic. Common trade names are Delrin and Ultraform. homopolymer It is a lubricious, strong, and resistant to creep and fatigue. It has good dimensional stability and relatively high abrasion and chemical resistance. Acetal is commonly used in quality toy parts, handles, knobs, and bearing parts. Delrin is approved by FDA for use in the food industry. Acetal resins were commonly used in the plumbing industry. However, they are sensitive to chlorine which leads to cracks in acetal plumbing fittings. The widespread failure of acetal moldings in potable and hot water supplies resulted in one of the largest class actions in the USA when acetal plumbing fittings cracked and caused floods of many homes in many states.